Birchbox, the beauty product subscription service that has raised $87m in financing from backers such as Comcast, has reportedly begun talks with retailers including Walmart over an acquisition.

Iheima has raised $27.3m in its initial public offering, becoming the first incubator to float in China and providing an exit to corporate investors Toread and Youyou.

Walt Disney Company has followed its $1bn investment in online streaming technology provider BamTech by upping its stake to 75% as it prepares to launch its own streaming service.

Nielsen has bought Nielsen Innovate graduate vBrand and will integrate the company's sport sponsorship tracking technology into its sports media offering.

The pharmaceutical company's acquisition of Novartis-backed IFM Therapeutics, consisting of $300m upfront and up to $2bn in milestone payments, is its fourth purchase of a CVC-backed company in under four years.

Ultralinq has acquired Intelesens, a wearable device manufacturer spun out from Ulster University in 2001.

UCB Pharma scored an exit after the bone disease therapy developer floated at the top of its range, having secured $92.5m in funding over the past two years.

Touchstone Innovations has doubled down in its efforts to prevent a hostile takeover by rival IP Group, saying the updated offer continues to undervalue the firm.

The social VR platform, which had raised almost $16m from investors including Tencent, Comcast and Alphabet, will close after failing to raise more funding.

The bankrupt saltwater electrolyte battery developer had raised $190m in financing since it was spun out from Carnegie Mellon eight years ago, but was bought for less than $9.2m.